Where: Chubut, Argentina (42.3° S, 69.2° W: paleocoordinates 44.8° S, 59.2° W)

• coordinate based on political unit

When: Casamayor Formation, Casamayoran (55.8 - 48.0 Ma)

• About six meters below lowest true tuff of the Casamayor

Environment/lithology: terrestrial; claystone

Size class: macrofossils

Collection methods: Original specimens are in the Feruglio Collection

Primary reference: G. G. Simpson. 1935. Descriptions of the oldest known South American mammals, from the Rio Chico Formation. American Museum Novitates 793:1-25 [J. Alroy/J. Wertheim/J. Wertheim] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 13781: authorized by John Alroy, entered by Jill Wertheim on 25.04.2002

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)